Greetings robot makers, here is my recent creation - a differential drive robot controlled from an Android device. The robot’s “brain” is Arduino Uno compatible board (an “Arduino on a breadboard”). The robot uses a JY-MCU Bluetooth module for communication with the Android phone. A custom Android app, created with the MIT App Inventor 2 essentially acts as a remote control, sending commands to the Arduino that tell the robot to move forward, reverse, stop or rotate. The robot has 2 hc-sr04 ultrasound and uses them to detect obstacles and override the manual commands, when I try to run it into a wall.